The 11LO1I and 11LO2I CRT's are single
beam electrostatic deflection cathode ray tubes of Soviet
manufacture. They are still available from E-Bay sellers.

Intended for use in oscilloscopes and
measuring equipment, these have a a flat screen and inbuilt graticule
grid lines. The 11LO1I ,11LO2I differ only in the scale of the
graticule grid; both have a green phosphor. They have post deflection
acceleration, which gives them high sensitivity , and makes them
useful for a simple high bandwidth X-Y display. The screen size is 80
* 64 mm and the spot size is < 0.5mm square.

I have taken the data from the label
supplied with the tube as well as looking round on Russian
information for these, but provide no guarantee whatsoever for
accuracy! The values vary between different sources; my values sit in
the middle of the published values. Soviet equipment, eg. The S1-65
(Осциллограф
С1-65 , schematic
pdf) oscilloscope uses a cathode voltage of -2 kV, and an anode 4
voltage of 8 kV .

Voltages Ux measured relative to the
average value of the deflection plate potentials (normally this is
ground voltage) unless stated.

It is possible to connect to all the pins with sleeved
DuPont/Berg style PV cable receptacles if you don't have sockets. The
HV connection for A4 is a TV style EHT “Ω”
connector with a rubber boot. Both the A4 and cathode voltages are
dangerous. Low current , low capacitance supplies are safest. The
tube may have an internal discharge resistor (spiral) , but it would
be very wise to check the power supplies and the tube are completely
discharged before connecting or disconnecting any wiring to the tube.

1: I have not calculated the bandwidth of the tube. The
internal geometry of the tube is clearly visible, so it should be
possible to estimate this. If anyone has the time and can be
bothered, please let me know. The intrinsic bandwidth would be at
least some hundreds of mHz , but the somewhat thin and curly wires to
deflection plates would probably be more limiting.

2: The deflection current Idefl would normally be very
low , but might increase suddenly if the beam is overdeflected onto
the plates.